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UKNOF Talk From Plan A to Plan B

Learn about Community Fibre's journey in rolling out IPv6 to their customers without spending money. Explore the challenges they faced, the solutions they implemented, and the key takeaways from their successful IPv6 deployment.

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UKNOF Talk From Plan A to Plan B

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  1. UKNOF TalkFrom Plan A to Plan B Making IPv6 Real Sam Defriez – Head of Networks

  2. Who am I and who are Community Fibre? • Despite the name Community Fibre are not…. • Although we are very proud of our presence within much of London's social housing • Largest FTTH provider in London • Fastest ISP in UK 2018 – thinkbroadband.com speed tests • 5 *’s on Trustpilot • XGS-PON – alt-net – disruptor?! • Why IPv6 rollout?

  3. Introduction • What we wanted to achieve • Roll out IPv6 to our customers without spending money • Best Consumer ISP ISPA award… doh • IPv4 is expensive now • First step towards a v6 to v4 translation strategy? • Nice simple plan A • We made some interesting discoveries along the way • Good ways to break your own network • That the IPv6 internet has some major blackholes

  4. PLAN A • Pre-IPv6 Project Network Design: Distributed DHCPv4 design • PLAN A: Use the cabinet router to provide DHCPv6 with PD to dual stack customers. • However we hit a few problems…

  5. PLAN B • PLAN B: Centralised DHCP design • OLT as DHCPv6 relay • Multiple advantages to this centralised design. • Simpler DHCP management, and logging • Increased functionality • Free options • Centralised design (above) looks a lot like our logo • DHCPv6 first, DHCPv4 later

  6. First though, an IPv6 subnetting plan. Yay! • We have 75 PoPs and a /29 v6 block from Ripe. • /48’s to our customers • More addresses please Ripe

  7. Centralised DHCP – why KEA • Kea – ISCs newest open source DHCP server. • Quickly able to test • Newbie (us) friendly • Kea met requirements: • DHCPv4 server • DHCPv6 server + PD • Static assignments for v4 and v6 • Forensic logging of customer to IP • Redundancy • Flexible REST API

  8. Centralised DHCP Design

  9. Teething Problems….

  10. Financial Restrictions…. • Circa 20% of our PoPs do not have an OLT that supports IPv6 DHCP relay. • Equipment refresh required • It’s very hard at present to make a case for spending money on IPv6 migration strategies • Finance – “How much will it make us?” • Engineer – “Nothing at the moment, but at some stage v4 will be deprecated” • Finance – “Come back to me nearer to that date.” • An entirely logical argument.

  11. CFL Network Problems…. • A few self caused issues. Oops. • Automation fail. • Gateway address as a lease • Swiftly rectified but still…

  12. IPv6 Internet Problems…. • Cogent! • Upon first testing IPv6 in the lab we could not reach Google. • Cogent blackhole to Google • Cake needed?

  13. KEA Problems • CPU / memory exhaustion • 100% CPU use and resulting memory exhaustion. • Kea HA bug - issue concurrently handling inbound client requests and partner lease updates in some situations • Fixed in v1.6 • The graph of server death…..

  14. Out the other side and into successful IPv6 deployment! • Around 20% of our traffic now running over IPv6 • Expected destinations – Google, Facebook, Netflix, Twitch etc.

  15. Conclusion • We like Kea  • ISC support is superb • Key take-aways • Don’t set the default gateway as an available lease address • Don’t rely on Cogent with a default-route for IPv6 • Do test Kea if you run DHCP servers and see if you like it

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